Engraving Pen Product Type Engraving Pen Compatible Workpiece Material Metal Plastic Duty Industrial Maximum Strokes per Minute 18 750 stroke/min Collet Size Not Applicable Number of Tips Included 1 Tip Types Included Medium Point Stylus Required Pressure 90 psi Air Consumption 1.5 cfm Air Inlet Size 1/8 in Air Inlet Type NPT Minimum Hose Size 1/4 in Speed Settings Variable Tool Length 5 5/8 in Tool Weight 0.3 lb Number of Hoses Included 0 Number of Speed Settings Continuous